OEF proba
--- Introduction ---

This module actually contains 5 exercises on elementary probability.

Birthdays

If we suppose that people's birthdays are fairly distributed among the 365 days of the year, and if we randomly pick up persons from the phone directory, what is the probability for that at least two of these persons have the same birthday?

Black and white

We have black balls and white balls in a bag. If two balls are randomly extracted from the bag, what is the probability for them to be ?

Coins

We suppose that each time we toss a coin, the probability of obtaining face up is exactly 1/2.

If we toss times the coin, what is the probability of obtaining exactly times the face up?

Walking on highway

According to the statistics, a pedestrian walking on a certain portion of highway during 1 minute has a probability of to be knocked down by a car.

Mr. X wants to make a bet of walking on this portion of highway during minutes, without becoming victime of accident. What is his chance to win this crazy bet?

Red and green

We have red balls and green balls in a bag. If balls are randomly extracted from the bag, what is the probability for them to be red and green?

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Description: collection of exercises on elementary probability. This is the main site of WIMS (WWW Interactive Multipurpose Server): interactive exercises, online calculators and plotters, mathematical recreation and games

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